ALSAN Coating SIL 402 is a VOC compliant, high solids, single component, silicone roof coating and protective barrier for a variety of low slope roof surfaces and substrates. Upon cure, ALSAN Coating SIL 402 forms a durable, weatherproof coating that is highly resistant to degradation from UV and natural weathering. ALSAN Coating SIL 402 may be applied as a maintenance coating over sound and dry single ply (TPO, PVC, EPDM, and CSPE), modified bitumen, BUR, metal roofing and/or other approved existing coatings.

Product Properties

  • Material Resin
  • Technology Silicone


ALSAN Coating SIL 402 can be applied using a single component airless spray equipment, a roller or a brush. Prior to starting the application, perform an adhesion test on each surface type to ensure adequate bond can be achieved or if a primer or other specific surface preparation is required. Assure ambient and substrate temperatures remain 40°F (4.4°C) or above, to assure proper application and curing. NOTE: ALSAN Coating SIL 402 reacts with atmospheric moisture to cure. Once containers are open and exposed to the atmosphere, a skin will form on the material over time, which must be removed from the bulk material before use. Coverage rates are based on a maximum 2:12 slope if applying ALSAN Coating SIL 402 on a higher slope, it will be applied in multiple thinner coats to achieve same desired coverage rate.

Testing & Approvals

CRRC ENERGY STAR FBC FL13806-R8  Liquid-Applied Roof Systems FM UL

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